The partno and description columns are the essential text to search, and the assembly and model columns serve as groups to further filter results.

partno和description列是要搜索的主要文本，而assembly和model列用作进一步过滤结果的组。

Because the partno field is declared unique, repeated upload operations of the same part number merely replace the old index record with a new record.

由于声明了 partno 字段惟一，因此重复上传同一个部件号将只用新记录替换旧索引记录。